And you were wondering how she got that Rolling Stone cover story last month ... .

A source told the Huffington Post that Cyrus and the 26-year-old former boyfriend of Liv Tyler have been dating on the low-down since summer, when he photographed her for his dad's magazine.

But, if they've been dating since summer, that means she and Liam Hemsworth broke up earlier than they claimed. Unless Cyrus was juggling boys, which would be morally reprehensible and in no way very cool at all.

Reports that Cyrus and Wenner were a thing first started circulating after she hosted “Saturday Night Live” on Oct. 5. Sources told RadarOnline she left the show's after-party early to meet up with Wenner.